When you draw an ellipse this way using real pins, pencil, and string, the length of the string can’t change. To emulate this real-world behavior, we can lock the value of the variable L.
- In the Variables list, select L and click the lock icon below the list. A plus sign (+) appears next to the locked variable in the Locked column.
- Select points A or C and drag them. With the length of the string constant, B traces the same locus no matter which point you drag.
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